Terminal block for electrical apparatus.



PATENTED MAY 14, 1907.

W. M. BRADSHAW.

TERMINAL BLUGK FGR- ELEOTRIOA L APPARATUS.

APPLIOATIOH FILED APn.2e,19oa.

2 SHEETS-SHEET 1.

Fig. 71

WITNESSES: fid? ATTORN EY ZIgWM 42% a5, Q

PATENTED MAY. 14, 1907.

A W. M. BRADSHAW. TERMINAL BLOCK FOR ELECTRICAL APPARATUS APPLIOATION FILED APR. 28, 1906.

2 SHEETS-SHEET 2.

Big. 2.

WITNESSES:

lNVENTOR e blocks for electrical measuring instruments WILLIAMEL BRADSI'LAW, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO- WESTINGHOUSE ELECTRIC & MANUFAC'IURING COMPANY, CQRPO- RATION OF PENNSYLVANIA.

TERMINAL sLocK Foe ELEQTRECAL APPAnearhe.v

Specification. of Letters Patent.

Application filed April 28, 1906. ale No. 314,211.

Eatented ma 14, 1907.

To all whom it may concern:

Be it known that I, WiLtianM. BRAD- SHAW, a citizen ofthe United States, and a resident of Wilkinsburg, in the countyoi Allegheny and State of Pennsylvania, have invented anew and useful Improvement in Terminal. {Blocks .for Electrical Apparatus, of which the following is a specification.

. My invention relates to windings and ter-.

' minal blocks for electrical translating devices and particularly to those that are em ployed in electrical measuring instruments.

The object of my invention is to provide a convenient and compact structure and arrangement of the windings and terminal readily assembled. p

Electrical measuring instruments that are employed for measuring the energy of polyphase. circuits frequently comprise two instruments of the character that are employed to measure the energy of singlephase circuits, the movablemembers of which are connected together. Instruments of this class, are usually provided with windings that are arranged'i'n series with the external circuit, and When adapted to be supplied with f larg'e 'amounts of current, that are formed 6 of, comparatively large and 'inflexihle conv 'ductors. In such cases it is desirable to se; 3 cure rigidly thereto, or to form integral therewith, terminal pieces having-clamping means, and Whentwo series windings are employed ina polyphase orother single instrument, it is futher desirable that they be disposed in such close proximity to each other as to enable the employment of terminal blocks of convenient and compactstructure. 4o It is the object of the present invention to construct and arrange the parts in this manner. I Figure 1 of the accompanying drawings is a view, in rear elevation, of a portion of an instrument that embodies my invention, certain of the parts. being broken. awayfor, ,tlie sake of clearness of illustration. F ig. 2 is a view in section on the line lIH of Fig. 1 and Fig. 8 is a view in side elevation of one of the. parts of the instrument shown in Figs. i 1 and 2. I Secured by means of bolts 1 to the longer and other translating devices which may be terminal-blocks.

adapted to conduct large amounts of current,..

. other sides of an oblon j'casin 2, for the arts of i g P an instrument that embodies'my invention, are two-porcelain or glass ternnnal blocks 3 and a each of which 18 provided with openings'at' 5 and 6 that diverge] outwardly from each other at an angle 0f'appro imately90 and register with correspondingapertures 8 in the sidesof the casing-2. "The blocks are also provided with recesses 9'" that'are located between the divergent ends of the openings at 5 and G and register. With-cor responding openingslO in the sides of the casing, apertures at 12 and 13 providin communication between the recesses Qan the openings 5 and. 6. "The terminal block 4 is further-provided with openings 14 and 15 that also diverge outwardlyirom 'each' other at an angle of approximately 90 and between which and the recess 9 communication is ailorded by means of apertures 16. I The openings 10 in the sides of the casing are adapted to be covered by means of removable plates 17 when the instr'unientis in use. Supported by and between terminal. blocks 3 and 4 are two coils or windings 18 and- 19 for U-shaped magnetizahle cores 20 .and 21 respectively, each of the coils being provided, upon oppositeends, with split tubularterminal pieces and 23 thatprojectrespec; tivelyintoithe openings 5 and, 6 of-d'ifferent The coils ,here shown are and each comprises a;loop;24= of comparatively heavy strap conductor that surrounds both legs of the U-shapedmagnetizable core, and a piece 25 of T-shape, themain' body of which is located between the legs of.

the .U-shaped core and one end of-which is ured to one side of the loop/24 bv M ans of screws 26. The head of theT- shaped piece 25 locatedbetween the 0p.posite side of the loop and the Inagnet'izable core and is extended outwardly fromv the plane of the loop and toward one end thereof, the terminal piece being secured to or formed integral with its extremity. Theterof. the loop and may be secured thereto .i-niany su table manner, as hereshown or-may .be

' formed integral tl1erew; ith. The structure of The terminal pieces 22 and 2 3 are someminal piece 23 is located at the-oppositeend" what loosely fitted in the openings in-jthe terminal blocks, and the .coilsi --18 and '19 are spaced, apart a distance equal to,-- or greater than, that between dotted lines 27 and 28 be completely withdrawn from the openings [in the terminal blocks, and the parts may readily assembled and dismantled.

*of the coils.

- that are drawn parallel to thexopposing edges Thus,- when one of the coils is moved toward and into engagement with the other coil, the terminal pieces 22 and 23 may consequently be The tubular terminal pieces 22 and 23 are provided with flanges 29-a'nd- 30 along the 'edges'of the splits therein, the flanges being located in corresponding ofisets from the cy -lindrical openings 5. and 6 inthe terminal.

. blocks. 1 Screws 31, that are loosely fitted in one of the flangesand are threadedinto the 2D terminalpieces 22 a other, provide means whereby the tubular- 23 may be clamped to cylindrical terininal pieces 32 and-33 for.con-.

nection to an external circuit, the terminal pieces 32 and 33 projecting through the ap-J.

ertures in the casing 2 and the openings in the terminal blocks 3 and 4 into the tubular terminal pieces 22 and 23. The heads of the screws 31 are located in the aperture'sato12 and 13. The terminal pieces 32 and 33 are surrounded by insulating sleeves 34 that extend into the terminal-blocks 3 and las far as annular flanges or shoulders 35 and prevent engagement of the. terminal pieces with the casing 2. Rubber, felt 'or other resilient washers 36 are placed on the other sides of. the flan es35, between {the same and the ends of tering the casing through the openings in'the are threaded screws 39 the heads of which are" located in the apertures at 16, these terminal pieces being adapted to be connected to thev terminal-blocks. v j

Located in the apertures 14 and 15 inthe block 4 are terminal pieces 37 that are surrounded byinsulating sleeves 38 and in which shunt windings- (not shown) of the-instrument and to terminals (not shown) of anexternal clrcuit.

It will be -obs'erved that the heads of the clamping screws which are threaded into the terminal pieces are located in the aperturesat 12, 13 and 16 and are-accessible in the refcesses 9 in the terminal blocksto enable adjustment thereof, the recesses 9 being shaped so that a screw-driver inay beconveniently employed for effecting such adjustment. The invention maybe applied to other devices than electrical measuring instruments and the structural detailsand arrangement oi the parts may be varied within consider-' qable limits without departing from the spirit of the invention, and I desire that all such modifications shall be included within its scope. j

the tubular terminal pieces 22 and 23, ,for the purpose of preventing dust from enb ocks, and

7 I claim as my'invention:

"1.; The combinationwith a pairof blocks tend resptse ctively into the openings in different bloc 1 having diverging'opemngs and recesses'b'etween theopemngs, of two members each having diverging projections that extend re"- spectively into the openings of different pblocks. p .7

3. The combination with a pair of blocks 1 having diverging openingsa nd recesses'be-f twet'e'n the openings, of twolmem'bers each having diverging. projections that extend re- .s ectivel into' the openings of difl'erent b ocks, t e divergingprojections being proble in the recesses in the blocks.

s ectivel movable toward each other a sufficient dis- 'ectio ns of one of thegmeinbers from the openings in the block, and clamping means for the diverging projections that are accessible in the recesses in the blocks.

" 6. The combination w th a pair of blocks having diverging openings, of two-members tend respectively into the openings of difiere ent blocks; the said members being spaced 'apartand movable toward each other a sufli fromthe blocks.

' 7, Thejcombination with a p'airc of blocks each having diverging. pro ections that extend respectively into the openings of differa art andmovabletoward each other a-sufiiare threadedin the diverging projectionsand are accessible for adjustment in having diverging openings an recesses .be-

having diverging projections thatextend'res ectively into the opemn'g'g's -of;--

' vided with clamping means that areaccessi- 4. The combination with a pair ofblocks having diverging projections that extend re-'.

, into the openings of different 1b ocks, t e members being spaced apart and tanc'e to permit removal of the divergihg proeach having diverging projections that exhaving diverging openings, of two members c ent distance to permit .separationth-ereof' ,.from the blocks,- and clampingscrews that the recesses. 8. The combination with a pair of blocks tween the openings;. of two-members each" clamping-s rews that ar ethread having diverging openings, offtwo' members each having diverging projections that exi "2. The combination. with a pair of blocks roo cient distance to permit 'separation thereof a.

ent'blocks, the said members being spaced difierent 7 ed in the diverging projections and are accessible for adjustment in the recesses.

9. In an electrical device, the combination with two windings having diverging terminal pieces, of insulating blocks each having di-- minal pieces of different windings project,

the windings being spaced apart and movable toward each other a sufficient distance to permit separation of the windings from the loclis.

11. In an electrical device, the combination with two windings having diverging, terminal pieces, of a pair of insulatingblocks each having openings into which the terminal pieces of different windings project and recesses between the openings, and clamping.

means for the termina pieces that are accessible 1n the recesses.

In testimony whereof, I have hereuntosubscribed my name this 23rd day of April,

WILLIAM M. BRADSHAW.

Witnesses PAUL hIACGAHAN, BIRNEY HINES. 

